21121202199 has 16 divisors (see below), whose sum is σ = 29653796480. Its totient is φ = 13335204960.

The previous prime is 21121202177. The next prime is 21121202279. The reversal of 21121202199 is 99120212112.

It is not a de Polignac number, because 21121202199 - 2¹¹ = 21121200151 is a prime.

It is a super-2 number, since 2×21121202199² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121207199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112104 + ... + 234114.

It is an arithmetic number, because the mean of its divisors is an integer number (1853362280).

Almost surely, 2^21121202199 is an apocalyptic number.

21121202199 is a deficient number, since it is larger than the sum of its proper divisors (8532594281).

21121202199 is a wasteful number, since it uses less digits than its factorization.

21121202199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125070.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 21121202199 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred ninety-nine".